The system that can recognize whether a pinhead is inaccurate fitting and location in hackle is introduced. The system
includes several parts: lamp-house, pick-up camera, movement control card, step motor, hackle and switch. Image
collected by pick-up camera is auto-threshold, binary, located and template matched. As there is a tilt between hackle
and pins, collected image must be rectified before matching template. After the comparison of template and searching
graph, the system can get similarity automatically, the inaccurate fitting pinhead can be recognized easily, and it also can
give an alarm while there is inaccurate fitting. It is proved that recognizable ability and accuracy can meet the demand of
the production completely by experiment.